The discovery process matches the sysObjectID to an OID in the oid2type configuration files to identify:
System’s type (Host, Router, Switch, and so on), vendor, model, and certification level.
Which discovery drivers to use to probe the system.
Which instrumentation classes to use to monitor the system.
The discovery process searches for the drivers in the .import files, which are located in the BASEDIR/smarts/conf/discovery directory as the oid2type files.